Amusical setting of a poem for solo voice and piano is called a

A musical setting of a poem for solo voice and piano is called an Art Song.

Explanation:

An Art Song is a piece written for a solo voice, accompanied by the piano. It was the major genre used in classical music between 1750 and 1820. These poems were usually part or works created for a stage/theater, and weren't exclusive to piano pieces, other instruments were used too, although less commonly.

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